Ah I see, that is a bit suspect. Obviously the description of touching pixels as clusters is an easy one to come to, but I never saw it so well compiled and explored before Helm.
I think a wiki fails because it does not have the classic academic flavor that a book has. Wikis are not sequential, they don't ramp up from basic fundamental skills to complex concepts. ( of course one can choose to read in such an order, but there is power in forcing someone to turn page after page by the nature of the medium; with the only alternate being skipping ahead and the risk of being lost)
Monthly member fees is just about the quickest way I could think of to kill this place, or 90% of forums in general. annual fundraisers is ok, but I would think of the book as sort of a patreon thing as a donation, only people get something out of it ( people expect forums to be free, so that doesn't "count" even though the usefulness and value of this community is obvious)
To mitch30: I don't know how many people you will grab to get this book here, as a lot of the information is here for free on the forums. At best we wonder how a newcomer ( perhaps lurker) has successfully compiled all that information without the help of this community, at worst we might believe there is some plagiarism happening.
Don't mean to put you on a stake though! if all of this is your own material, and completely your own thoughts and ideas with only light referencing of other artists and authors ( as to be expected with any work) then putting a cohesive and helpful book together of any size is impressive.